mirror of
https://github.com/libretro/scummvm.git
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130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2003 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#ifndef AUDIOSTREAM_H
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#define AUDIOSTREAM_H
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#include "mixer.h"
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// TODO:
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// * maybe make readIntern return 16.16 or 24.8 fixed point values
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// since MAD (and maybe OggVorbis?) gives us those -> higher quality.
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// The rate converters should be able to deal with those just fine, too.
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// * possibly add MADInputStream and VorbisInputStream
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/**
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* Generic input stream for the resampling code.
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*/
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class AudioInputStream {
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protected:
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virtual int16 readIntern() = 0;
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virtual void advance() = 0;
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public:
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int16 read() { assert(size() > 0); int16 val = readIntern(); advance(); return val; }
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int16 peek() { assert(size() > 0); return readIntern(); }
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virtual int size() = 0;
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bool eof() { return size() <= 0; }
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};
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class ZeroInputStream : public AudioInputStream {
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protected:
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uint _len;
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int16 readIntern() { return 0; }
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void advance() { _len--; }
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public:
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ZeroInputStream(uint len) : _len(len) { }
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virtual int size() { return _len; }
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};
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class MemoryAudioInputStream : public AudioInputStream {
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protected:
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const byte *_ptr;
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const byte *_end;
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public:
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MemoryAudioInputStream(const byte *ptr, uint len) : _ptr(ptr), _end(ptr+len) { }
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};
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template<int channels>
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class Input8bitSignedStream : public MemoryAudioInputStream {
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protected:
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int16 readIntern() { int8 v = (int8)*_ptr; return v << 8; }
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void advance() { _ptr += channels; }
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public:
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Input8bitSignedStream(const byte *ptr, int len) : MemoryAudioInputStream(ptr, len) { }
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virtual int size() { return (_end - _ptr) / channels; }
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};
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template<int channels>
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class Input8bitUnsignedStream : public MemoryAudioInputStream {
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protected:
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int16 readIntern() { int8 v = (int8)(*_ptr ^ 0x80); return v << 8; }
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void advance() { _ptr += channels; }
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public:
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Input8bitUnsignedStream(const byte *ptr, int len) : MemoryAudioInputStream(ptr, len) { }
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virtual int size() { return (_end - _ptr) / channels; }
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};
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template<int channels>
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class Input16bitSignedStream : public MemoryAudioInputStream {
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protected:
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int16 readIntern() { return (int16)READ_BE_UINT16(_ptr); }
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void advance() { _ptr += 2*channels; }
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public:
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Input16bitSignedStream(const byte *ptr, int len) : MemoryAudioInputStream(ptr, len) { }
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virtual int size() { return (_end - _ptr) / (2 * channels); }
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};
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template<int channels>
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class Input16bitUnsignedStream : public MemoryAudioInputStream {
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protected:
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int16 readIntern() { return (int16)(READ_BE_UINT16(_ptr) ^ 0x8000); }
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void advance() { _ptr += 2*channels; }
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public:
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Input16bitUnsignedStream(const byte *ptr, int len) : MemoryAudioInputStream(ptr, len) { }
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virtual int size() { return (_end - _ptr) / (2 * channels); }
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};
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template<int channels>
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static AudioInputStream *makeInputStream(const byte *ptr, uint32 len, bool isUnsigned, bool is16Bit) {
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if (isUnsigned) {
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if (is16Bit)
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return new Input16bitUnsignedStream<channels>(ptr, len);
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else
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return new Input8bitUnsignedStream<channels>(ptr, len);
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} else {
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if (is16Bit)
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return new Input16bitSignedStream<channels>(ptr, len);
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else
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return new Input8bitSignedStream<channels>(ptr, len);
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}
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}
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static inline AudioInputStream *makeInputStream(byte _flags, const byte *ptr, uint32 len) {
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if (_flags & SoundMixer::FLAG_STEREO)
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return makeInputStream<2>(ptr, len, _flags & SoundMixer::FLAG_UNSIGNED, _flags & SoundMixer::FLAG_16BITS);
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else
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return makeInputStream<1>(ptr, len, _flags & SoundMixer::FLAG_UNSIGNED, _flags & SoundMixer::FLAG_16BITS);
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}
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#endif
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